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Superfluid response in electron-doped cuprate superconductors
1Institute of Theoretical Physics and Interdisciplinary Center of Theoretical Studies, Chinese Academy of Sciences, P. O. Box 2735, Beijing 100080, China.
Physical Review Letters
|February 9, 2005
Summary
We propose a two-band model explaining the unusual superfluid density in electron-doped cuprates. This model supports dx(2)(-y(2)) pairing symmetry, resolving experimental discrepancies.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Materials Science
Background:
- Electron-doped cuprates exhibit anomalous temperature dependence of superfluid density.
- Discrepancies exist in interpreting experimental measurements of their superconducting properties.
Purpose of the Study:
- To propose a theoretical model explaining the anomalous superfluid density in electron-doped cuprates.
- To unify the interpretation of experimental data regarding pairing symmetry.
Main Methods:
- Development of a weakly coupled two-band model.
- Inclusion of dx(2)(-y(2)) pairing symmetry.
Main Results:
- The model successfully explains the upward curvature of superfluid density near the critical temperature (Tc).
- It also accounts for the weak temperature dependence of superfluid density at low temperatures.
- Provides a unified explanation for experimental observations.
Conclusions:
- The proposed model supports predominantly dx(2)(-y(2)) pairing symmetry in electron-doped cuprates across the entire doping range.
- Resolves inconsistencies between different experimental interpretations.
- Offers a comprehensive understanding of their superconducting behavior.